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Nintendo Wii - Fire Emblem: Seisen no Keifu cheats

Access the arena as many times you want:
Beat all of the enemies in the arena in chapter 7. You will see a message, 
which will inform about no one left to fight at the castle. Leave your home 
castle, then go to one of the castles you conquered. You will see a message 
again, but if you go back to your home castle, you will access the arena again.